JP2013036282A - Reinforcement structure of existing building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reinforcement structure of an existing building, which enables the in-service building to be constructed without affecting a living environment, and which is excellent in stress transfer.SOLUTION: A reinforcement structure 1 of an existing building includes a pair of reinforcing frames 10 and 10 which are arranged in upper and lower positions with a slab 31 of the existing building 30 in between, and a joint member 20 which passes through the slab 31. The reinforcing frames 10 and 10 comprise reinforcing columns 11 and reinforcing beams 12. The joint member 20 is fixed to the slab 31, and connects a lower end of the reinforcing column 11 erected above the slab 31 and an upper end of the reinforcing column 11 erected below the slab 31.

Description

  The present invention relates to a reinforcing structure for an existing building.

Conventionally, when performing seismic reinforcement of an existing building, a reinforcing frame may be integrally joined to the outside of the existing building.
Generally, the reinforcement frame is joined to an existing building through a number of post-installed anchors that are driven into a frame structure such as an existing column or beam (see, for example, Patent Document 1).

  However, since the post-installed anchor is driven into the frame structure with noise and vibration, it may be difficult to use the building during the construction period when applied to an existing building in service.

  Therefore, the applicant of the present invention, as shown in Patent Document 2, as the reinforcement structure of an existing building that reinforces a building in service without greatly affecting the living environment, is the end of a balcony located outside the housing of the existing building. We propose a reinforcement structure for existing buildings that is configured to transmit a shear force during an earthquake between the frame and the reinforcement frame by forming a notch in the section and joining a reinforcement frame to the notch. ing.

JP-A-11-62264 JP 2010-196270 A

Since the reinforcement structure of the existing building of patent document 2 constructs a reinforcement frame on the outer side of a balcony, a reinforcement frame will necessarily be arrange | positioned in the position away from the column beam of the building.
Therefore, when the protruding length of the balcony is large, there is a possibility that stress transmission between the reinforcing frame and the casing may not be performed effectively.

  The present invention solves the above-mentioned problems, and it is possible to construct a building in service without greatly affecting the living environment, and to provide a reinforcement structure for an existing building having excellent stress transferability. The challenge is to propose.

  In order to solve the above-mentioned problem, a reinforcement structure for an existing building according to the present invention includes a pair of reinforcement frames disposed above and below a slab of an existing building, and a joining member that penetrates the slab. The reinforcing frame includes a reinforcing column and a reinforcing beam, and the joining member is fixed to the slab, and the lower end of the reinforcing column standing above the slab and the slab It connects with the upper end of the reinforcement pillar erected below.

According to the reinforcement structure of the existing building, the reinforcement frame can be brought close to the column beam (or wall) of the existing building, so that stress transmission is effectively performed.
In addition, since the reinforcement frame is fixed by a joining member penetrating the slab, post-installation anchors can be omitted or greatly reduced, and as a result, noise and vibration associated with construction can be minimized. Can be suppressed.

  In the reinforcing structure of the existing building, if the joining member connects the reinforcing columns in the vicinity of the axis of the reinforcing column, the joining of the reinforcing column and the slab may be close to pin joining. It becomes possible. Therefore, it is possible to prevent the stress from concentrating on the slab and to provide seismic reinforcement with a minimal burden on the existing frame.

If the joining member has a linear member that penetrates a through hole formed in the slab, and a gap between the inner surface of the through hole and the linear member is filled with a solidification material, Is easy and the construction period can be shortened.
That is, it is excellent in workability because the arrangement of the joining member is completed simply by drilling a through hole in the slab and fixing it with a solidifying material with the linear member passing through the through hole.
In addition, what is necessary is just to employ | adopt a bolt, the steel rod by which the screw processing was given, a steel wire etc. as a linear member.

  Prestress may be introduced into the reinforcing structure of the existing building by the linear member.

  The reinforcement structure of the existing building of this invention is excellent in stress transmission property, and it can construct | assemble the building in service without having a big influence on a living environment.

It is a perspective view which shows the reinforcement structure of the existing building which concerns on embodiment of this invention. It is a front view of a reinforcement frame. It is sectional drawing which shows the reinforcement structure of the existing building. (A) is AA sectional drawing of FIG. 2, (b) is BB sectional drawing of (a). (A) is a longitudinal cross-sectional view which shows a basic frame, (b) is CC sectional drawing of (a). (A)-(d) is sectional drawing which shows each construction step of the reinforcement structure of the existing building.

  As shown in FIG. 1, the reinforcement structure 1 for an existing building according to the present embodiment includes a pair of reinforcement frames 10, 10 disposed vertically with a slab 31 of the existing building 30 interposed therebetween, and a pair passing through the slab 31. And the joining member 20 for connecting the reinforcing frames 10 and 10 to each other.

  As shown in FIG. 2, the reinforcing frame 10 is configured by combining steel materials, and includes reinforcing columns 11 and reinforcing beams 12. Although the material which comprises the reinforcement frame 10 is not limited, In this embodiment, it is comprised with the H-section steel.

The reinforcing frame 10 is formed adjacent to the outer wall surface or the window frame on the balcony of each floor of the existing building 30.
As shown in FIG. 1, the reinforcing frame 10 is connected to other reinforcing frames 10 adjacent in the vertical and horizontal directions to form a lattice-shaped reinforcing frame.

  The reinforcing pillar 11 is fixed to upper and lower slabs 31, 31 that project outside the existing building 30. The upper end of the reinforcing column 11 is fixed to the slab 31 on the upper floor via the joining member 20, and the lower end of the reinforcing column 11 is fixed to the slab 31 on the lower floor via the joining member 20.

End plates 13 and 13 are integrally fixed to the upper and lower ends of the reinforcing column 11 as shown in FIG.
As shown in FIGS. 4A and 4B, the end plate 13 has two bolt holes 13a and 13a adjacent to the axis of the reinforcing column 11 (in this embodiment, a H-shaped steel web). The place is formed.

  The bolt holes 13 a and 13 a are formed at positions facing each other with the web 11 a of the reinforcing column 11 interposed therebetween. The joining member 20 is inserted through the bolt holes 13a and 13a.

  As shown in FIG. 2, the reinforcing beam 12 is extended from the upper and lower portions of the reinforcing column 11 to the left and right. In the present embodiment, with respect to one reinforcing column 11 (for each floor), Two upper and lower stages are formed.

  Since the distance between the upper and lower reinforcing beams 12, 12 of this embodiment is larger than the distance between the slab 31 and the reinforcing beam 12, the view from the room is not blocked by the reinforcing beam 12.

  The reinforcing beam 12 is formed by fixing beam members 12a and 12a integrally to the left and right side surfaces of the reinforcing column 11, respectively. The method for fixing the beam member 12a to the reinforcing column 11 is not limited.

Adjacent reinforcement frames 10 are connected to each other by joining only the webs via the splice plates 14 and 14 with the end faces of the reinforcement beams 12 and 12 butting each other.
In other words, the left and right reinforcing beams 12, 12 are sandwiched from the front and rear by the splice plates 14, 14 disposed across the web, and fixed by fastening the splice plates 14, 14 and the web with bolts penetrating the web. .

  When the left and right reinforcing frames 10 are connected to each other, a rectangular space surrounded by the left and right reinforcing columns 11 and 11 and the upper and lower reinforcing beams 12 and 12 is formed as shown in FIG.

  It should be noted that the reinforcement frames 10 adjacent to the left and right are joined at a position where the bending moment acting on the reinforcement beam 12 becomes small and between the left and right reinforcement columns 11, 11.

  The joining member 20 is fixed to the slab 31. The joining member 20 connects the lower end of the reinforcing column 11 erected above the slab 31 to the upper end of the reinforcing column 11 erected below the slab 31, and fixes each reinforcing column 11 to the slab 31. doing.

  As shown in FIG. 4A, the joining member 20 of the present embodiment includes a bolt (linear member) 21 and a nut 22 that is screwed to the bolt 21.

The shaft portion of the bolt 21 is disposed in a through hole 32 formed in the slab 31.
The shaft portion of the bolt 21 passes through the bolt hole 13a of the end plate 13 of the reinforcing column 11 disposed vertically.

The head of the bolt 21 is in contact with the lower surface of the end plate 13 of the reinforcing column 11 on the lower floor.
A nut 23 is welded to the upper surface of the end plate 13 of the reinforcing pillar 11 on the lower floor, and the shaft portion of the bolt 21 passes through the nut 23.

  The nut 22 is screwed to the shaft portion of the bolt 21 on the upper side of the end plate 13 of the reinforcing column 11 on the upper floor. The end plate 13 is fixed to the slab 31 by tightening the nut 22.

As shown in FIG. 3, the slab 31 constitutes a part of the frame structure of the existing building 30 and is a horizontal member integrally connected to the pillar 33 and the beam 34.
The slab 31 of the present embodiment constitutes a floor portion of a balcony formed outside the existing building 30.

As shown in FIG. 4A, the slab 31 is formed with a through hole 32 for arranging the joining member 20.
The through hole 32 is formed in the vicinity of the axial center of the reinforcing column 11 that is disposed above and below the slab 31, and coincides with the position of the bolt hole 13 a formed in the end plate 13 of the reinforcing column 11. Yes.

A clearance between the shaft portion of the bolt 21 disposed in the through hole 32 and the inner surface of the through hole 32 is filled with a solidifying material 40.
That is, the bolt 21 is fixed to the slab 31 via the solidified solidified material 40.
In addition, although the material which comprises the solidification material 40 is not limited, Grout is used in this embodiment.

  In the present embodiment, the solidification material 40 is filled between the end plate 13 and the slab 31 to prevent a gap from being formed between the reinforcing frame 10 and the slab 31. In addition, what is necessary is just to perform the filling of the solidification material 40 between the end plate 13 and the slab 31 as needed. For example, it may be omitted when the end plate 13 and the surface of the slab 31 are in close contact with each other without a gap, or when another adjustment member is disposed between the end plate 13 and the slab 31.

  In the present embodiment, as shown in FIG. 5A, the base frame 50 is formed on the first floor portion of the existing building 30, and the lowermost (second floor portion) reinforcing frame 10 is connected to the base frame 50. .

The foundation frame 50 is joined to the pillar 33 of the existing building 30 and is mounted on a foundation beam 54 formed on the foundation ground of the foundation frame 50.
The basic frame 50 may be formed as necessary. Further, the formation location of the basic frame 50 is not limited to the first floor portion.

  The foundation frame 50 includes a reinforcing column 51, a reinforcing beam 52, and a joining concrete member 53.

The column member 51 is erected between the upper floor (second floor) slab 31 and the foundation beam 54, and the upper end of the column member 51 is coupled to the upper floor reinforcing column 11 via the joining member 20. A stud bolt 55 protrudes from the reinforcing column 51 and is integrally joined with the joining concrete member 53.
Since the details of the reinforcing column 51 are the same as those of the reinforcing column 11 constituting the reinforcing frame 10, detailed description thereof is omitted.

The reinforcing beam 52 extends from the reinforcing column 51 to the left and right, and is fixed to the upper end and the lower end of the reinforcing column 51 in this embodiment. The reinforcing beam 52 may be omitted at the entrance / exit of the existing building 30.
Since the details of the other reinforcing beams 52 are the same as those of the reinforcing beams 12 constituting the reinforcing frame 10, detailed description thereof is omitted.

  The joining concrete member 53 is a reinforced concrete member formed between the reinforcing column 51 and the column 33 of the existing building 30.

One end of the joining concrete member 53 is inserted into a U-shaped space formed by the flange of the reinforcing column 51 and the web.
The stud bolts 55, 55 projecting from the reinforcing column 51 and the post-installed anchors 56, 56 are driven into the column 33, and the reinforcing column 51 and the column 33 are fixed integrally. . The configuration of the joining concrete member 53 is not limited.

The foundation beam 54 is formed immediately below the foundation frame 50 and supports the foundation frame 50 and the joining concrete member 53.
The configuration of the foundation beam 54 is not limited. Further, instead of the foundation beam 54, another foundation member may be arranged.

Next, the construction method of the reinforcement structure 1 of this embodiment is demonstrated.
In this embodiment, the foundation frame 50 is formed on the first floor prior to the construction of the reinforcing structure 1. The reinforcement frame 10 on the second floor is attached using the basic frame 50, and the reinforcement frame 10 on the upper floor is attached using the reinforcement frame 10 on the lower floor in the third floor and above.

The concrete construction method of the reinforcement structure 1 is as follows.
First, as shown in FIG. 6A, through holes 32 and 32 are formed in the slab 31. In the present embodiment, drilling is performed using a low-noise core drill.

  After the through holes 32 and 32 are formed, the base mortar 15 for constructing the reinforcing pillar 11 is placed in the vicinity of the through holes 32 and 32 on the upper surface of the slab 31. The base mortar 15 is placed at a position directly below the web of the reinforcing pillar 11. Note that the base mortar 15 may be provided if necessary and may be omitted. Moreover, it may replace with base mortar and may arrange | position other members, such as a steel plate for load receiving.

  In addition, the lower-level reinforcement frame 10 is assembled below the slab 31. The reinforcement frame 10 arranged on the lower floor is temporarily secured by taking a copy with a pipe or the like.

  Next, as shown in FIG. 6B, the bolt 21 is screwed into the nut 23 of the end plate 13 of the reinforcement frame 10 on the lower floor, and the shaft portion of the bolt 21 is inserted into the through hole 32.

Subsequently, the reinforcing frame 10 is assembled on the slab 31.
The shafts of the bolts 21, 21 that pass through the through holes 32, 32 are brought into communication with the end plate 13 of the reinforcement frame 10 on the upper floor, and the nuts 22, 22 are screwed into the shafts protruding above the end plate 13. By doing so, the upper and lower reinforcing frames 10, 10 are connected and fixed to the slab.

  Subsequently, as shown in FIG. 6C, a mold 41 is installed so as to surround the end plates 13 and 13 of the upper and lower reinforcing frames 10.

  After the mold 41 is installed, the solidifying material 40 is filled in the gap between the reinforcing frame 10 and the slab 31 and the gap between the bolt 21 and the through hole 32, and the upper and lower reinforcing frames 10, 10 and the slab 31 are joined.

When the installation of the reinforcing frame 10 is completed, the reinforcing frame is finish-painted as necessary.
The finish coating may be performed every time each reinforcing frame 10 is installed, or may be collectively performed after the installation of the reinforcing frame 10 is completed for the entire existing building 30.

According to the reinforcement structure 1 of the existing building of this embodiment, the reinforcement frame 10 can be brought close to the pillar 33 and the beam 34 (or the wall) of the existing building 30 regardless of the size of the overhang length of the slab 31. Stress transmission between the frame structure of the existing building 30 and the reinforcing frame 10 is effectively performed.
That is, the position of the through-hole 32 can be set relatively freely regardless of the length of the overhanging length of the slab 31, so that even if the overhanging length of the slab 31 is large, the pillars 33, It can approach the beam 34 (or wall).

  Since the reinforcing structure 1 is arranged with a large number of reinforcing columns 11, the load per reinforcing column 11 is reduced and stress transmission is possible by joining to the slab 31.

Moreover, since the reinforcement frame 10 is fixed through the joining member 20 disposed through the slab 31 without using the post-construction anchor, it is necessary to drive the post-construction anchor into the column 33 or the beam 34. It has excellent workability and can minimize noise and vibration associated with construction.
In other words, since the post-construction anchor construction is limited to only the portion of the foundation frame 50, the building is reinforced without stopping the use of the building in service or minimizing the period of stoppage of use. Can be done.

  Since the joining member 20 is disposed in the vicinity of the axial center of the reinforcing column 11, the reinforcing column 11 and the slab 31 are in a state close to pin joining, and as a result, stress concentration on the slab 31 is prevented. Therefore, seismic reinforcement that minimizes the burden on the existing frame is possible.

  Further, since the reinforcing beams 12 are joined to each other at a position where the bending moment at the intermediate portion between the reinforcing columns 11 is minimized, the joining portion between the reinforcing beams 12 does not become a weak point.

Since the reinforcement pillars 11 are connected to each other using the bolts 21, the construction is easy and the construction period can be shortened.
That is, since the through-hole 32 is drilled in the slab 31 and the bolt 21 is passed through the through-hole 32 and is fixed by the solidifying material 40, the arrangement of the joining member 20 is completed. Yes.

  Moreover, since it is comprised so that the shearing force at the time of an earthquake may be mutually transmitted between the reinforcement frame 10 and the existing building 30, a desired reinforcement effect can be ensured.

Moreover, since the reinforcement structure 1 is comprised by fixing the reinforcement frame 10 to the slab 31, it can be employ | adopted for every building.
Further, by performing the construction while using the existing building 30, it is difficult to be subject to time restrictions on the construction, and it is possible to perform a short-term construction as a whole and to reduce the cost.

  The preferred embodiments according to the present invention have been described above, but the present invention is not limited to the above-described embodiments, and various design changes can be made without departing from the spirit of the present invention.

  For example, in the said embodiment, although the volt | bolt 21 was used as a linear member, the material which comprises a linear member is not limited. For example, a steel rod, a steel wire, a steel strand may be used.

The configuration of the joining member 20 is not limited to the configuration shown in the embodiment. For example, the nut 23 may be disposed as necessary and may be omitted. The nut 23 is not necessarily welded to the end plate 13.
Moreover, in the said embodiment, although the reinforcement pillar 11 of the upper floor was fixed by the double nuts 22 and 22, the nut 22 does not necessarily need to be a double nut.

  Further, prestress may be introduced into the joint portion between the reinforcing frame 10 and the slab 31 by a linear member.

  Although the said embodiment demonstrated the case where the reinforcement frame 10 was fixed to the slab 31 which comprises the floor part of a balcony, the installation location of the reinforcement frame 10 is not limited. For example, the reinforcing frame 10 may be fixed to the floor slab in the room.

  Moreover, although the said embodiment demonstrated the case where a reinforcement frame was comprised with a steel frame structure, the structure of a reinforcement frame is not limited to a steel frame structure, For example, even if one part or all is comprised with a reinforced concrete structure. Good.

DESCRIPTION OF SYMBOLS 1 Reinforcement structure 10 Reinforcement frame 11 Reinforcement pillar 12 Reinforcement beam 20 Joining member 21 Bolt (linear member)
30 Existing building 31 Slab 32 Through hole 40 Solidified material

Claims (4)

A pair of reinforcing frames disposed above and below the slab of the existing building;
A joining member penetrating the slab, and a reinforcing structure of an existing building,
The reinforcing frame includes a reinforcing column and a reinforcing beam,
The joining member is fixed to the slab, and connects a lower end of a reinforcing column erected above the slab and an upper end of a reinforcing column erected below the slab. Reinforcement structure of existing buildings.   The reinforcing structure for an existing building according to claim 1, wherein the joining member connects the reinforcing columns to each other in the vicinity of the axial center of the reinforcing column. The joining member has a linear member that penetrates a through hole formed in the slab,
The reinforcing structure for an existing building according to claim 1 or 2, wherein a gap between the inner surface of the through hole and the linear member is filled with a solidifying material.   The reinforcement structure for an existing building according to claim 3, wherein prestress is introduced by the linear member.

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